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April 2009

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2009.04.01 15:03 "Needs help on Jpeg7 compression & decompression for tiff images", by Sanjeev Balachander

Hi,

I am currently working on implementing the JPEG 7 compression for tiff
images and encountered few difficulties in implementing the same. Needs some
help on resolving it.

Currently if we look into the tiff image using binary image editor we can
see that the JPEG 7 compression information is appearing in 2 different
places one pointed by tag 273 Stripoffsets and other by tag 347 known as
JPEGTables.  In 347 we have global slots JPEGTables information and tag 273
contains offset to the other image information.  Now i am not sure how to
take these 2 information before putting on to the JPEG De-compressor.  Do i
need to take both of them? or i can ignore any one of them?

Also i am facing the problem of putting the image information to the JPEG
tables when compressing the image.  What steps do i have to take for putting
these data when placing them on JPEGTables(Tag 347) and the image data
(Placed in offeset of tag 273) ?

Kindly provide me some information on these if any one know about it.


Regards
Balachander, Sanjeev